A new algorithm of digital image watermarking based on hyperchaotic theory

Based on the hyperchaos and Discrete Wavelet Transform (DWT) algorithm, combined with the Arnold scrambling method, a novel digital image watermarking algorithm is presented in this paper. The method makes use of Arnold method to weaken the correlation among the pixels of the watermark and adopts Haken system to generate the hyperchaotic key sequence to undertake the second encryption, strengthening the security of the watermarking. Furthermore, the paper proposes an improved embedding scheme, in which the encrypted watermarking is embedded into the original image with different strength according to the characteristics of human vision system (HVS). The experimental results show that the scheme improves the invisibility and robustness, and possesses strong anti-attack.